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Related Experiment Video

Updated: Jun 28, 2026

The Transition to an Anterior-Based Muscle Sparing Approach Improves Early Postoperative Function but is Associated with a Learning Curve
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Combined anteversion technique for total hip arthroplasty.

Lawrence D Dorr1, Aamer Malik, Manish Dastane

  • 1The Arthritis Institute at Good Samaritan Hospital, Los Angeles, CA 90017, USA. Patriciajpaul@yahoo.com

Clinical Orthopaedics and Related Research
|November 4, 2008
PubMed
Summary

Computer navigation accurately guides total hip arthroplasty (THA) stem placement, achieving a safe combined anteversion in 96% of cases. This method improves precision compared to surgeon estimates, ensuring optimal implant positioning.

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Area of Science:

  • Orthopedic Surgery
  • Biomedical Engineering

Background:

  • Combined cup and stem anteversion in total hip arthroplasty (THA) is a proposed method to correct abnormal femoral anteversion.
  • Computer navigation offers a potential tool to improve the accuracy of achieving desired anteversion angles during THA.

Purpose of the Study:

  • To investigate the accuracy and precision of a combined anteversion technique for THA using computer navigation.
  • To compare surgeon's estimation of femoral stem anteversion with computer navigation measurements.

Main Methods:

  • 47 THAs were performed using computer navigation.
  • Surgeons estimated femoral broach anteversion, which was then validated by navigation.
  • Navigated stem anteversion was confirmed with postoperative CT scans.
  • Cup implantation was performed using navigation alone.

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Individualized Stem-positioning in Calcar-guided Short-stem Total Hip Arthroplasty
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Individualized Stem-positioning in Calcar-guided Short-stem Total Hip Arthroplasty

Published on: February 27, 2018

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Last Updated: Jun 28, 2026

The Transition to an Anterior-Based Muscle Sparing Approach Improves Early Postoperative Function but is Associated with a Learning Curve
09:51

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Published on: September 7, 2022

Individualized Stem-positioning in Calcar-guided Short-stem Total Hip Arthroplasty
09:31

Individualized Stem-positioning in Calcar-guided Short-stem Total Hip Arthroplasty

Published on: February 27, 2018

Main Results:

  • Computer navigation demonstrated high accuracy for stem anteversion (precision: 4.8°, bias: 0.2°) compared to postoperative CT scans.
  • Surgeon's estimation of stem anteversion showed lower precision (16.8°) and similar bias (0.2°).
  • 96% of hips achieved a combined anteversion within the safe zone (25°-50°) using computer navigation.

Conclusions:

  • Computer navigation is an accurate tool for achieving desired stem anteversion in THA.
  • The combined anteversion technique with navigation is effective in placing implants within the safe zone.
  • Significant variability exists in native femoral stem anteversion, highlighting the need for accurate implant positioning.